<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
#div1{ width:200px; height:200px; background:red; position:absolute; float:left;}
</style>
<script>
var timer=null;
function starMove()
{
	var oDiv=document.getElementById('div1');
	clearInterval(timer);
	timer=setInterval(function(){
		var speed=10;
		if(oDiv.offsetLeft>=300)
		{
			clearInterval(timer);
		}
		else
		{
		oDiv.style.left=oDiv.offsetLeft+speed+'px';
		}
		},30);
	
}
</script>
</head>

<body>
<input id="btn1" type="button" value="开始运动" onclick="starMove()"/>
<div id="div1">
</div>
</body>
</html>
